I have a psychological trick for you. First let me say, how the hell can this woman not have noticed the green discharge and the yellow discoloration. This is not a wise mother. Anyway, here is the trick. First, tell your friend you have to tell her something and you know how she will behave and describe in great detail how you know she will behave. Ex: "I know that you will be close-minded and shut me off. You are going to be mad and storm off and not speak to me and probably even end our relationship. But this is so important that "I AM GOING TO TAKE THE RISK" because I care about you so much that I have to face the negative consequences & your wrath." Then tell her. I guarantee, she won't act the way you described and if you know her well you should be able to paint a very accurate description. Tell her about the color and the discharge and suggest she may not have noticed it but she should see her doctor. Even show her the color and the discharge if she is still there. If this doesn't work, she's really screwed up. You may have to really go that extra step and call child protection to check on the health of the baby. They will do it anonomously but of course she will guess it was you. But what is more important? Your relationship with an insecure idiot or the welfare of this baby? Personally I couldn't handle being friends with someone like that. Anyway when you decide to tell her try it this way. It has worked for me every time.